JP3936166B2 - Vehicle seat structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat structure provided with a headrest on an upper portion of a seat back that can protect a seated person's head from an impact such as a rear collision.
[0002]
[Prior art]
For example, when a so-called rear impact such as a collision at the time of reverse of the automobile or a rear-end collision to the rear of the automobile occurs, the seated person's head tends to tilt backward rapidly under the inertial force. Such a sharp backward tilting of the head is called a whiplash movement, and this whiplash movement may damage the neck of the seated person. Various possible configurations are provided in the seats of automobiles and the like.
[0003]
As such a seat that can suppress the whiplash movement, for example, a configuration having a so-called movable headrest that forcibly rotates or slides the headrest forward from a normal support position is known. Yes.
[0004]
As this type of seat structure having a movable headrest, for example, a configuration disclosed in Japanese Patent Laid-Open No. 09-315196 can be exemplified.
[0005]
In this known configuration, the headrest is provided so as to be capable of rotating back and forth or sliding back and forth with respect to the upper end of the stay. And this well-known structure, when a rear impact is input, the headrest is moved under the forward movement (rotation, slide) of the headrest accompanying the inertial movement of the inertial mass body (weight body) built in the headrest. The gap between the head and the head, that is, the backward tilting range of the head is instantly narrowed, and the protection of the seated person's head and neck is strengthened by suppressing the whiplash movement by the increased support ability. It is something to try.
[0006]
[Problems to be solved by the invention]
By the way, in the known configuration disclosed in the aforementioned Japanese Patent Application Laid-Open No. 09-315196, the headrest is provided so as to be able to rotate with respect to the upper end of the stay or to be able to slide relative thereto.
[0007]
However, since the upper end of the stay is located inside the headrest, in this former case, the rotation fulcrum is located inside the headrest. Thus, when the pivot point of the headrest is located inside the headrest, the radius of rotation of the headrest tends to be small, and the rear support impact is generated although there is no particular influence at the normal support position located at the rear. When the headrest pivots forward from its normal support position, that is, tilts forward, the cushion surface of the headrest that presupposes contact with the seated person's head is largely tilted downward under the forward tilt. It will be.
[0008]
In such a headrest posture in which the cushion surface is greatly inclined downward, the head of the seated person naturally comes into contact with the upper end of the headrest. Even if it tilts (rotates) to the position, it is inevitable that the support capability by the headrest slightly decreases.
[0009]
For example, if the shape of the headrest is a shape that can be adapted to the forward leaning posture, it is possible to sufficiently prevent such a decrease in support capability when a rear collision occurs. However, since the headrest shape tends to be uncomfortable, it is inevitable that the appearance quality of the seat is deteriorated. Further, since there is no denying the possibility of adversely affecting the support capability at the normal support position, it is difficult to say that such a headrest shape change is effective in every sense.
[0010]
On the other hand, if the headrest is slid forward as in the latter case, the cushion surface does not tilt as in the forward tilt, so that the support capability can be maintained sufficiently high. However, in this known configuration, since the headrest is slid with respect to the upper end of the stay located inside the headrest, the slide mechanism is naturally incorporated in the headrest.
[0011]
That is, in the latter configuration in which the headrest is slid forward, the mechanism portion or the like inside the headrest is likely to be increased in size, and the headrest itself may be increased in size or the cushion surface may be reduced in width. This cannot be denied.
[0012]
Further, in this known configuration, an inertial mass body (weight body) that detects an impact such as a rear collision is incorporated in the headrest when the headrest rotates forward or slides forward. In other words, in this known configuration, the weight of the headrest itself is unavoidable, and it is necessary to increase the rigidity of the stay that supports the headrest and the holding force of the stay against the seat back. In many cases, the configuration may be complicated.
[0013]
An object of the present invention is to provide a vehicle seat structure that can enhance the protection of the head and neck of a seated person during a rear-end collision without complicating the configuration or increasing the weight of the headrest. .
[0014]
[Means for Solving the Problems]
  to this end,thisAccording to the invention shown in claim 1,It has a stay that extends downward and can be adjusted up and down at the top of the seat back.The headrest is disposed in the seat back so as to be able to pivot back and forth between a normal support position located behind and an emergency support position defined in front of the normal support position and serving as an emergency support position. The headrest is held at its normal support position by engagement of the engagement means with the inertial load resulting from the rear impact impact as a reference of the engagement force. .
[0015]
  And the weight body with a predetermined weight is below it with the pivot point in betweenAnd behind the stayIn position, integrally with the headrestBackwardWhen an inertial load that is pivotally arranged and connected and exceeds the engagement force of the engagement means is generated on the weight body under a rear impact, the inertial movement of the weight body with the forced release of the engagement means Originally, the headrest is rotated forward in the direction of the emergency support position in front of the normal support position, and when the headrest reaches the emergency support position, the headrest is locked under the lock means that can automatically lock. Forcibly held in the emergency support positionis doing.
[0016]
Furthermore, the unlocking means can be interlocked with the locking means and can be operated from the outside of the seat back, and the emergency support is provided by the unlocking operation to the locking means by the unlocking means at the emergency support position of the headrest. The vehicle seat structure is configured so that the headrest can be arbitrarily returned from the position to the normal support position.
[0017]
  According to a second aspect of the present invention, a hinge shaft extending in the left-right direction of the seat is rotatably connected to and supported by the upper end of the seat back frame forming the skeleton of the seat back via a pair of left and right hinge brackets. The turning fulcrum according to claim 1 is embodied. And the weight body is below the hinge shaftAnd behind the stayIntegrated with the headrest in positionBackwardBy integrally connecting and fixing to the hinge shaft via a hanging shaft so as to be able to rotate, the integral rotation of the weight body with the headrest is ensured.
[0018]
Furthermore, in claim 3 of the present invention, the substantially fan-shaped lock plate having the circular arc circumferential surface as a guide surface is fixedly disposed at one end of the hinge shaft so as to be capable of integral rotation with the hinge shaft, A lock claw is movably disposed on the hinge bracket so as to be slidable on the guide surface of the lock plate under the biasing force of the lock spring. Then, it can become an engagement means under the combination with the lock claw, and can become a lock means under the combination with the engagement of the lock claw, an engagement recess as a notch-like recess that can be engaged, and the lock claw. , Lock recesses of the same configuration are formed at spaced positions of the lock plate, and the lock plate rotation is restricted when the lock claw is selectively engaged and engaged with each recess by the biasing force of the lock spring. Thus, the headrest can be held at the corresponding positions of the initial support position and the emergency support position.
[0019]
According to a fourth aspect of the present invention, the unlocking means can be operated from outside the seat back so that the push button exposed at the upper end of the seat back under the support of the hinge bracket and the lock claw The hinge bracket is pivotally mounted on the outer surface side of the inner surface of the hinge bracket and is connected to the lock claw by an interlocking pin that passes through a long guide hole formed in the hinge bracket. A support plate and a connecting rod for connecting the support plate and the push button so as to be interlocked are formed.
[0020]
Furthermore, according to claim 5 of the present invention, the stay holder to which the stay can be inserted is integrally supported on the hinge shaft, and the stay holder can be attached to and detached from the stay, so that the headrest with respect to the seat back is provided. Desorption is possible.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0022]
As shown in FIGS. 1 and 2, in the vehicle seat structure 10 according to the present invention, a headrest 12 is formed so as to be mounted on an upper portion of a seatback 14 via a stay 16. In the present invention, the headrest 12 is supported by the rotation fulcrum 18 disposed inside the seat back 14 so as to be rotatable in the front-rear direction.
[0023]
The headrest 12, for example, has a frame body (not shown) arranged around the upper end of the stay 16 as a skeleton, and an elastic body (pad body) 20 is arranged around the frame, and this is covered with a trim cover or the like. By covering with the body 22, the head of the seated person can be elastically supported. The headrest 12 can be attached to the upper portion of the seat back 14 by inserting the stay 16 extending downward into the stay holder 24, for example.
[0024]
It should be noted that the basic configuration of such a headrest 12 is no different from a general configuration having a stay extending downward, and the configuration of the headrest itself is not the gist of the present invention, so the details here The detailed explanation is omitted.
[0025]
Here, as can be seen from FIG. 3 in addition to FIG. 1, in this embodiment, for example, a hinge extending in the left-right direction of the seat is used as the rotation fulcrum 18 arranged in the seat back of the headrest 12. A shaft is illustrated. This hinge shaft (rotation fulcrum) 18 is pivotally supported by a pair of left and right hinge brackets 28-L and 28-R fixed to the upper end 26 of the seat back frame forming the skeleton of the seat back 14. Yes.
[0026]
As shown in FIG. 3, for example, on the hinge bracket 28-L side, the hinge shaft 18 is connected to and supported by the hinge bracket 28-L via a pin 34 with a washer 32, and the hinge bracket 28-L On the R side, it is connected to and supported by the hinge bracket 28-R via a pin 38 and a washer 40 of the lock plate 36 described later. In this embodiment, a stay holder 24 to which the headrest stay 16 is inserted is connected to the hinge shaft so that the hinge shaft 18 serves as a pivotal fulcrum of the headrest 12.
[0027]
For example, a pair of left and right base brackets 42 are fixed to the left and right spaced positions of the hinge shaft 18, and a pipe-shaped guide bracket 44 is further fixed to each of the base brackets. The stay holder 24 is fixedly connected to and held by the guide bracket 44 under the insertion, so that the stay holder can be connected to the hinge shaft 18.
[0028]
Here, it is preferable that the stay holder 24 has a configuration including, for example, a lock unit and a lock release unit (both not shown). By using the stay holder 24 having such a configuration, it is possible to adjust the height of the headrest 12 with respect to the seat back 14 and to detach it.
[0029]
The structure of the stay holder having the locking means and the unlocking means is known per se, and since the structure itself is not the gist of the present invention, a detailed description thereof is omitted here.
As described above, since the hinge shaft 18 is merely pivotally supported between the left and right hinge brackets 28-L and 28-R, the headrest 12 connected to and supported by the hinge shaft is The seatback 14 is rotated in the front-rear direction around the hinge shaft (see FIG. 1).
[0030]
As shown in FIG. 2, for example, by providing a slit 45 of an appropriate length that communicates with the stay holder 24 at the upper end of the seat back 14, the hinge shaft in the seat back with the stay 16 and eventually the stay holder can be attached. It goes without saying that the pivoting of the headrest 12 at the center is easily and smoothly ensured.
[0031]
Here, the rotation range of the headrest 12 in the present invention is the normal support position shown in FIG. 1 located at the rear and the normal support position in an emergency, that is, the occurrence of a rear impact impact. It is defined as between the emergency support position of FIG. 4 defined further forward. In the present invention, the weight body 46 having a predetermined weight is pivotally connected to the headrest 12 at a position below the hinge shaft 18 so that the weight body 46 at the time of occurrence of a rear impact impact. Due to the inertial movement of the body, the headrest is rotated forward from the normal support position in FIG. 1 to the emergency support position in FIG.
[0032]
When a so-called rear collision impact such as a collision at the time of reverse of the automobile or a rear-end collision to the rear of the automobile occurs, an impact load F from the rear of the automobile indicated by an arrow in FIG. Acts on 14. Then, since a force that tries to remain in the initial position against the impact load F is generated in the weight body 46, the force opposite to the acting direction of the impact load F becomes an inertial force, and the rear of the seat (right in the figure) The movement of the weight body in the direction of ()) is the inertial movement of the weight body.
[0033]
As shown in FIGS. 1A and 3, the weight body 46 is formed as a rod-like body extending in the left-right direction of the seat, for example, and is partly fixed to the hinge shaft 18 so as to move downward from the hinge shaft. The hinge shaft is integrally connected to and fixed to the hinge shaft via a hanging shaft 48 depending on the shaft.
[0034]
Here, in the present invention, the headrest 12 can be held at its normal support position by the engagement of the engagement means 50 with the inertial load resulting from the rear impact as a reference of the engagement force, and the automatic support is automatically performed. The headrest can be forcibly held in the emergency support position under the lock of the locking means 52 capable of locking operation.
[0035]
As can be seen from FIGS. 1 and 3, in this embodiment, for example, a substantially fan-shaped lock plate 36 having a circular arc circumferential surface as a guide surface 36 a can rotate integrally with the hinge shaft 18. In addition, for example, the locking claw 56 can be slidably contacted with the guide surface of the lock plate under the biasing force of the lock spring 58, while being fixedly disposed at one end of the hinge shaft via a detent boss 54. A hinge bracket on the side, that is, a hinge bracket 28-R is movably disposed.
[0036]
The lock claw 56 is rotatably disposed on the inner surface side of the hinge bracket 28-R, for example, by being pivotally attached by the hinge pin 60. Then, the biasing force of the lock spring 58 formed of, for example, a tension coil spring, is laid and stretched between the locking pin 62 protruding from the lock claw 56 and the outer end piece of the hinge bracket 28-R. Originally, this lock claw is biased in the sliding contact direction with respect to the lock plate guide surface.
[0037]
As will be described later, the locking pin 62 of the locking claw penetrates from the inner surface side of the hinge bracket 28-R to the outer surface side through a long guide hole 64 formed in the hinge bracket 28-R. Therefore, as shown in FIGS. 1B and 3, a lock spring 58 is disposed on the outer surface side of the hinge bracket 28-R.
[0038]
Then, the engagement means 50 can be combined with the lock claw 56, the engagement of the lock claw, the engagement recess as the notch-shaped recess that can be engaged, and the lock means under the combination with the lock claw Lock recesses of the same configuration, which can be 52, are formed at the separation positions of the lock plate 36, respectively.
[0039]
As described above, the engagement force of the lock claw 56 with respect to the engagement recess (engagement means) 50 of this lock plate is set with the inertial load resulting from the rear impact as a reference for the engagement force. For example, the adjustment is made by the biasing force of the lock spring 58 or the shape of the notch-shaped recess serving as the engagement recess. For example, the engagement recess is formed in a so-called ratchet gear shape that can ensure only forward rotation of the headrest 12 from this engagement state.
[0040]
The lock recess (lock means) 52 is required to be automatically locked, that is, to automatically engage and engage the lock claw 56 with the lock recess. However, the lock claw 56 forcibly released from engagement with the engagement recess 50 in the normal support position of the headrest 12 is forcibly moved to the guide surface 36a by the rotation of the lock plate 36 associated with the hinge shaft 18. Slid in contact. The lock claw 56 is automatically engaged and engaged under the biasing force of the lock spring 58 due to the alignment of the lock claw 56 with the lock recess 52 as the lock plate 36 is further rotated. According to this configuration, automatic locking of the lock recess can be ensured.
[0041]
For example, in the normal support position of the headrest 12 shown in FIG. 1, when a rear impact of the automobile occurs, an impact load F resulting from the impact is input to the seat, and thus the seat back 14. Then, due to the inertial load that opposes the impact load F, the weight body 46 tries to rotate about the hinge shaft 18 in the counterclockwise direction (rearward direction) together with the hinge shaft. When the inertia load exceeds the engagement force of the lock claw 56 with respect to the engagement recess 50, the weight body 46 with the hinge shaft 18 as the center of rotation accompanied by the forced release of the engagement between the engagement recess and the lock claw Due to the inertial movement, the headrest 12 is rotated forward from the normal support position in FIG. 1 toward the emergency support position in the front (left side in the figure) with the hinge shaft as a rotation fulcrum.
[0042]
When the headrest 12 that has been rotated forward in accordance with the inertial movement of the weight body 46 rearward reaches the emergency support position, as shown in FIG. 4, the lock is applied under the biasing force of the lock spring 58. The headrest is fixedly held at the emergency support position by the automatic engagement and engagement of the lock claw 56 with the recess 52.
[0043]
In this way, with the occurrence of a rear impact, if the headrest 12 is moved to the emergency support position and further fixedly held at the emergency support position, the gap behind the head is filled by this headrest, A sudden and extreme backward tilt of the head following the backward movement of the seated person's upper body at the time of a rear collision or the like is reliably suppressed. Therefore, the whiplash movement caused by the rapid backward tilting of the head can be surely suppressed, and the damage to the seated person can be further reduced by sufficiently improving the protection effect of the head and neck during a rear-end collision.
[0044]
By the way, when the headrest 12 is held at the emergency support position in front of the normal support position as described above, the support is effective and appropriate at the time of a rear impact, etc. A headrest prevents normal seating on the seat.
[0045]
Therefore, in the present invention, the lock release means 66 is provided so as to be interlocked with the lock claw 56 that can be the lock means in combination with the lock means, that is, the lock recess 52, so The engagement, engagement, that is, lock, can be arbitrarily released.
[0046]
As shown in FIGS. 1 and 4, the unlocking means 66 is formed, for example, on the outer surface side of the hinge bracket 28-R in which the lock claw 56 is arranged on the inner surface side.
[0047]
The unlocking means 66 is first provided with a push button 68 that can be pressed. The push button 68 is disposed on the garnish 70 fixed to the upper end of the hinge bracket 28-R so as to be movable up and down, and is exposed at the upper end of the seat back 14 so as to be operable from outside the seat back ( (See FIG. 2).
[0048]
The unlocking means 66 includes a support plate 74 that is pivotally attached to the outer surface of the hinge bracket 28-R by a hinge pin 72. The support plate 74 is connected to a lock claw 56 disposed on the inner surface side of the hinge bracket 28-R via a lock claw locking pin 62 so as to be interlocked. Then, by connecting the support plate 74 and the push button 68 via the connecting rod 76 so as to be interlocked, the lock pawl 56 can be rotated against the biasing force of the lock spring 58 by the push button pressing operation. The lock release means 66 is configured as possible.
[0049]
Note that the lock spring 58 of the lock claw can also be used as a return spring for biasing and holding the push button 68 in the upper initial position.
[0050]
When the push button 68 is pressed at the emergency support position of the headrest 12 held by the engagement and engagement of the lock claw 56 with the lock recess 52, as shown in FIG. 5, the lock claw is forcibly separated from the lock recess. Thus, the lock between the lock recess and the lock claw is released. That is, since there is no restriction on the rotation relative to the hinge shaft 18, the headrest 12 is rotated in the direction of the normal support position behind the headrest 12, and the headrest can be easily removed from the emergency support position. When the headrest 12 is moved to the normal support position, the headrest is returned to the initial normal support position by the engagement between the engagement recess 50 and the lock claw 56 due to the biasing force of the lock spring 58.
[0051]
As described above, in the vehicle seat structure 10 of the present invention, the headrest 12 can be rotated from the normal support position to the emergency support position under the occurrence of a rear impact, and the headrest 12 is moved to the emergency support position. Can be fixedly held. In this way, if the headrest 12 is fixedly held in the emergency support position, the gap behind the head is filled by the headrest, so that the head is rapidly and radically inclined backward following the rearward movement of the seated person's upper body. Is reliably deterred.
[0052]
Therefore, the whiplash movement caused by the rapid backward tilting of the head can be surely suppressed, and the damage to the seated person can be further reduced by sufficiently improving the protection effect of the head and neck during a rear-end collision.
[0053]
In the present invention, since the pivot point of the headrest 12 is disposed inside the seat back 14, the pivot radius of the headrest can be secured sufficiently long. In other words, even if the headrest 12 is moved to the emergency support position under the forward rotation, the large forward tilt of the cushion surface 12a of the headrest can be reliably suppressed, so that emergency support with sufficient cushioning is possible. According to this, it can be easily secured.
[0054]
Therefore, the cushioning property at the headrest 12 at the emergency support position can be secured sufficiently high, and the safety is further improved.
[0055]
Since the cushion surface 12a of the headrest at the normal support position can be the head contact position at the emergency support position, the headrest at the time of occurrence of the rear impact is not changed without changing the shape of the headrest to the corresponding shape. Part support is possible appropriately.
[0056]
Accordingly, it is possible to reliably enhance the protection effect on the head without deteriorating the appearance quality of the headrest 12, and thus the seat itself.
[0057]
In the present invention, the weight body 46 is disposed in the seat back 14. That is, since the weight and size of the headrest 12 can be reliably prevented, the safety of the headrest can be further ensured. Further, since the weight of the headrest 12 can be prevented, there is no need to increase the rigidity of the stay 16 and the holding force of the stay with respect to the seat back 14, so that the overall configuration can be surely simplified. It is.
[0058]
Further, in the present invention, since the headrest 12 is moved from the normal support position to the emergency support position by rotating the headrest 12 back and forth, the headrest can be quickly and easily moved from the normal support position to the emergency support position. Become. Since the headrest 12 is pivoted back and forth by the pivot center disposed inside the seat back 14, there is no need to dispose a mechanism or the like for the pivoting inside the headrest.
[0059]
In other words, since the structure capable of moving to and holding the emergency support position without adding any hand to the headrest 12 can be obtained, the width of the cushion surface 12a due to the increase in the size of the headrest or the presence of a mechanism portion or the like can be obtained. The adverse effects on the headrest, such as conversion, can be reliably eliminated. Therefore, also from this point, the safety can be further enhanced.
[0060]
In the present invention, since the unlocking means 66 is provided, it is easy to arbitrarily return the headrest to the normal support position by the unlocking operation of the headrest 12 at the emergency support position. Accordingly, the seating posture after the occurrence of the rear impact can be easily ensured without being obstructed by the headrest 12, so that the usage performance is also improved.
[0061]
Here, in the embodiment of the present invention, the combination of the lock claw 56, the engagement recess 50 provided in the lock plate 38, and the lock recess 52 is embodied as the engagement means and the lock means, respectively. However, the engagement means holds the headrest 12 in the normal support position, and the lock means only needs to be able to hold the headrest fixedly in the emergency support position under the automatic lock. However, the engaging means and the locking means may be formed as other configurations.
[0062]
However, according to such a configuration, the engaging means and the locking means can be shared and shared, thereby reducing the number of parts, so that the configuration can be simplified easily.
[0063]
Further, the engagement means is not limited to the combination of the engagement recess 50 and the lock claw 56 because it is sufficient to hold the headrest 12 in the normal support position. For example, the headrest 12 is biased by a spring member or the like. It is good also as a structure which can be hold | maintained in the normal support position.
[0064]
In this case, the biasing force of the spring member that biases and holds the headrest 12 to the normal support position is set with reference to the inertial load resulting from the rear impact.
[0065]
Further, in the embodiment of the present invention, the hinge shaft 18 is embodied as a pivotal fulcrum of the headrest 12, but it is sufficient if the headrest is rotatably supported and further disposed inside the seat back 14. Therefore, it is not limited to a hinge shaft, For example, it is good also as a structure which connects and supports a headrest to a seat back by using a hinge pin etc. as a rotation fulcrum.
[0066]
Furthermore, in the embodiment of the present invention, the lock release means 66 is embodied as a combination of the push button 68, the support plate 74, and the connecting rod 76. Since it is sufficient to be able to release the engagement between them, the present invention is not limited to this configuration, and the lock releasing means may be formed from other configurations.
[0067]
However, if the lock release means 66 is formed as the configuration shown in this embodiment, the lock means can be appropriately unlocked without complicating the overall configuration.
[0068]
In this embodiment, the headrest stay 16 can be attached to and detached from the stay holder 24, but it is sufficient that the headrest 12 is connected to the hinge shaft 18 in the seat back, that is, the rotation fulcrum. However, the present invention is not limited to this. For example, the stay may be fixed to the hinge shaft or the like so that the stay cannot be attached to and detached from the hinge shaft, that is, the seat back 14.
[0069]
In this way, if the stay 16 is fixed to the hinge shaft 18 or the like, the extension end of the stay extending downward from the hinge shaft can be used as a hanging shaft integrated with the hinge shaft. By fixing 46 to the extended end of the stay integrally, the number of parts can be sufficiently reduced.
[0070]
However, if the headrest stay 16 is detachably inserted into the stay holder 24 as in this embodiment, the height of the headrest 12 can be adjusted, and the headrest The advantage of being detachable, for example, the seat cover can be replaced can be easily secured.
[0071]
Therefore, even a seat provided with a headrest that can be moved to the emergency support position can be handled in the same manner as a normal seat, and therefore, the improvement of its versatility can be sufficiently expected according to the present invention. it can.
[0072]
The above-described embodiments are for explaining the present invention, and do not limit the present invention. All modifications, alterations, and the like within the technical scope of the present invention are included in the present invention. It goes without saying that it is done.
[0073]
【The invention's effect】
As described above, according to the vehicle seat structure according to the present invention, the gap behind the head is filled by the forward rotation of the headrest to the emergency support position, so that the whiplash caused by the sudden backward tilt of the head Exercise is reliably suppressed. Therefore, the damage to the seated person is further reduced by sufficiently improving the protective effect of the head and neck at the time of rear collision.
[0074]
And since the rotation fulcrum of a headrest is arrange | positioned in a seat back, the rotation radius of a headrest can be ensured long enough. In other words, even if the headrest is moved to the emergency support position under its forward rotation, it is possible to reliably suppress a large forward tilt of the cushion surface of the headrest, thereby ensuring emergency support with sufficient cushioning properties. Therefore, the cushioning property at the headrest at the emergency support position can be secured sufficiently high according to this, and the safety is further improved.
[0075]
Furthermore, since the cushion surface of the headrest at the normal support position can be the head contact position at the emergency support position, the head at the time of rear impact impact without changing the shape of the headrest to the corresponding shape. Support is possible properly.
[0076]
Therefore, it is possible to reliably enhance the protection effect on the head without deteriorating the appearance quality of the headrest and thus the seat itself.
[0077]
Further, since the weight body is disposed inside the seat back, the weight and size of the headrest can be reliably prevented. In other words, the safety of the headrest can be ensured even higher, and the necessity of strengthening the rigidity of the stay and strengthening the holding force of the stay against the seat back is eliminated. I can be taken.
[0078]
Further, according to the present invention, the headrest is moved from the normal support position to the emergency support position by rotating the headrest back and forth, so that the headrest can be quickly and easily moved from the normal support position to the emergency support position. . Further, since the headrest is rotated back and forth by the center of rotation disposed inside the seat back, there is no need to dispose a mechanism or the like for the rotation inside the headrest.
[0079]
In other words, a configuration that can be moved to and maintained at the emergency support position without adding any effort to the headrest is obtained, so that the headrest is enlarged or the cushion surface is narrowed due to the presence of a mechanism, etc. The adverse effects on the headrest can be surely eliminated. Therefore, also from this point, the safety can be further enhanced.
[0080]
Further, since the unlocking means is provided, it is easy to arbitrarily return the headrest to the normal support position by the unlocking operation at the emergency support position of the headrest. Accordingly, the sitting posture after the occurrence of the rear impact can be easily ensured without being obstructed by the headrest, so that the use performance is also improved.
[0081]
If the combination of the lock claw, the engagement recess provided in the lock plate, and the lock recess is the engagement means and the lock means, respectively, the engagement means and the lock means can be shared and shared. Thus, the number of parts can be reduced, and the configuration can be simplified easily.
[0082]
Further, if the lock release means is a combination of a push button, a support plate, and a connecting rod, the lock means can be appropriately unlocked without complicating the overall configuration.
[0083]
Furthermore, if the headrest stay can be attached to and detached from the stay holder, the height of the headrest can be adjusted, as well as the advantages of being able to attach and remove the headrest, for example, the seat cover can be replaced, It can be easily secured. Therefore, even a seat provided with a headrest that can be moved to the emergency support position can be handled in the same manner as a normal seat, and therefore, the improvement of its versatility can be sufficiently expected according to the present invention. it can.
[Brief description of the drawings]
FIG. 1 is a schematic side view inside a hinge bracket and a schematic side view outside the hinge bracket, showing a vehicle seat structure of the present invention in a normal support position of a headrest.
FIG. 2 is a schematic perspective view of a vehicle seat having a headrest.
FIG. 3 is a schematic partially exploded perspective view of a vehicle seat structure.
FIG. 4 is a schematic side view inside the hinge bracket and a schematic side view outside the hinge bracket, showing the vehicle seat structure at the emergency support position of the headrest.
FIGS. 5A and 5B are a schematic side view on the inner side of the hinge bracket and a schematic side view on the outer side of the vehicle seat structure during the unlocking operation at the emergency support position of the headrest. FIGS.
[Explanation of symbols]
10 Vehicle seat structure
12 Headrest
14 Seat back
18 Hinge shaft (rotating fulcrum)
36 Lock plate
46 Weight
50 Engagement means (engagement recess)
52 Locking means (lock recess)
56 Locking claw
58 Lock spring
66 Unlocking means
68 Push button
74 Support plate
76 Connecting rod

Claims (5)

A vehicle seat provided with a headrest having a stay extending downward on the upper portion of the seat back so as to be adjustable up and down .
The headrest is disposed in the seat back so as to be able to pivot back and forth between a normal support position located behind and an emergency support position defined in front of the normal support position and serving as an emergency support position. The headrest is held at its normal support position by the engagement of the engagement means with the inertial load resulting from the rear impact impact as a reference of the engagement force.
A weight body having a predetermined weight is disposed and connected in the seat back so as to be rotatable integrally with the headrest at a position below the rotation fulcrum and at a rear position of the stay. When an inertial load exceeding the resultant force is generated in the weight body under a rear impact, the headrest is moved to the emergency support position in front of the normal support position under the inertial movement of the weight body with the forced release of the engaging means. When the headrest reaches the emergency support position, the headrest is forcibly held in the emergency support position under the lock of the locking means capable of automatic locking.
The unlocking means can be interlocked with the locking means and can be operated from the outside of the seat back, and the emergency release position of the headrest from the emergency support position by the unlocking operation with respect to the locking means by the unlocking means. A vehicle seat structure that can arbitrarily return the headrest to the normal support position. A vehicle seat provided with a headrest having a stay extending downward on the upper portion of the seat back so as to be adjustable up and down .
A hinge shaft extending in the left-right direction of the seat is connected to and supported by the upper end of the seat back frame that forms the skeleton of the seat back via a pair of left and right hinge brackets, and the stay on the hinge shaft that serves as a pivot fulcrum. By connecting the headrest to the seat back, the headrest can be pivoted back and forth between a normal support position located rearward and an emergency support position defined in front of the normal support position and serving as an emergency support position. The headrest is held in its normal support position by the engagement of the engagement means with the inertial load resulting from the rear impact impact as a reference of the engagement force.
A weight body having a predetermined weight is connected and fixed integrally to the hinge shaft via a hanging shaft in the seat back so that the weight body can rotate rearwardly integrally with the headrest at a position below the hinge shaft and behind the stay. When an inertial load exceeding the engagement force of the engagement means is generated in the weight body under a rear impact, the headrest is normally moved under the inertial movement of the weight body with the forced release of the engagement means. When the headrest reaches the emergency support position, the headrest is forced to the emergency support position under the lock of the locking means that can automatically lock when the headrest reaches the emergency support position. The lock release means can be interlocked with the lock means and can be operated from the outside of the seat back. The unlocking operation with respect to the locking means according to Unlock means, from the emergency support position to the normal support position, arbitrarily and the seat structure for a vehicle to return the headrest.   A substantially fan-shaped lock plate with the arc circumference as a guide surface is fixedly disposed at one end of the hinge shaft so as to be able to rotate integrally with the hinge shaft, and the lock claw is provided with the biasing force of the lock spring. Can be slidably contacted with the guide surface of the lock plate, is movably disposed on the hinge bracket, and can be used as an engagement means in combination with the lock claw. Lock recesses of the same configuration, which can serve as locking means in combination with the engagement recesses and the lock pawls, are formed at the separation positions of the lock plates, respectively, and the respective springs are biased by the biasing force of the lock springs. The headrest can be held at the corresponding positions of the initial support position and the emergency support position by restricting the rotation of the lock plate with the selective engagement and engagement of the lock pawl. The vehicle seat structure according to claim 2, wherein the.   A push button that is exposed at the upper end of the seat back under the support of the hinge bracket so that the unlocking means can be operated from the outside of the seat back; A support plate that is pivotally mounted on the side and connected to the lock claw by an interlocking pin that passes through an elongated guide hole formed in the hinge bracket; and the support plate and the push button The vehicle seat structure according to claim 3, comprising: a connecting rod that connects the two together so as to be interlocked with each other.   5. The headrest can be attached to and detached from the seat back by integrally supporting a stay holder to which the stay can be attached to the hinge shaft, and making the stay holder detachable. The vehicle seat structure according to any one of the above.

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